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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0944f35e1e9944bf39d7a70763de332ad58179c0c198e88dd1c60656382b4d08' 
  AND token = 'xvjMlS4IqJGsurdUrUeQ/X9NKb8kN+FkU2ahZsd9XHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00188

JSON explain

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