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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e048e51f7bfc93647cac65c393a6b1bc3da3908394de4a8d0ab2b5c1594736e2' 
  AND token = 'c5vUX94c9knq8q4MbkB6LeLWYg+bV/e7D8opNLBoqa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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