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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94be05b88398e642b594eb12d4c5de463beb49aa0581847a822e14594d66f63e' 
  AND token = '1mmP9k4i+qL1Tyuk70UoZvaD8VRkRf1zcoG1ur42tL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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