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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b80ca8883287c70ba385395b770e34e5f5d8316c69de08e84813fc33184f779' 
  AND token = 'rnCL5Z92h++JWr8l/pBAe9HMZm/Ns0MW/bFLI4iu6hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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