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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f253895d1d64479a1b78e35c3cd3553ca347426e5cf2ef0219cb339ff5d9076e' 
  AND token = 'hbC5/ThiRYQYNoDT7mVqk6T7jdopZQR7DYz2XMcv/34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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