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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f244e9f9f672d46dbdb816f41f757c449a4b40f65b2b1de5298ba326f66eda' 
  AND token = '6KEKPd/QbKiKG5V201Re1Jr72tPWTSCHVdHkq3mi3IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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