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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ea7ca3c6edf049450a689eff304b6dfe7dfc90eeb7d4b255d138dc80ead2f1' 
  AND token = 'jPz0GZFsFkCG1aWU6w5QX7VwZ5JrPDP4jduu+sIWNHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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