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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509c417e63b01d7e8793847d97e86a9a669bf3ce7cd39e618c6700002cac30e6' 
  AND token = 'pZbB4BTXEalWcGlTYS/bOuU3DUq6Afi6aGFkpgbF7sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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