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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0436f9f520c93b500edfbae2b4a7694dc9d6833f9e2e7710fc888868c543dc85' 
  AND token = 'Gk4MEm2h8Avc1h54zEqbNBqQQGlICLvoDnQNsByQ5+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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