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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc195e03ef7b6766a626f297fc0b85a9b1f918814e498725102296196e7757e5' 
  AND token = 'gx6iM8GlRUSg11CvMMXFIEdxrFnaj0kVWcHIPViyj8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}