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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d528d9ccc174d46474a4ce4d76da1c1ab8e5dd0e08a545ea29c7a58118c8ae6' 
  AND token = 'KEq7vtGARdceFn/jC0RHcvfH+9WILVeyCLK8aRLfTQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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