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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ecfa3182b20b9bee25643713cf16f332800dcd0a6ac0eb13b5de94e88d84012' 
  AND token = '+Rb7WlZP1wbAeRdVACAdDxs3ewxic0I1/7pHXU1nGA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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