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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95a099262e3ad93e6df3a4f2c90f25cbeabddb74db7f65214804c31206d9d6e' 
  AND token = 'ENtLKFpMuNH2CA/g+ZEFqpUhcy5gECA9Sq95eThwkNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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