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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8128ad125a20f276f0b5fb5f8da99267254b0d5ea638dc43050b68860d013f52' 
  AND token = 'LYtZGw8sfYUf69k9AeNengQhKrr/8Iec7sqV4a1kchs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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