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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6c742b2f504964f689e801bf082a4d454e6284fa30246dc08188613005acd5' 
  AND token = 'BTiTNoO/RyK8hYN7AYnfDJ/7Dr0Or7Pr8pfWurgCky4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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