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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4d6015fe9c1aae369f6d3e1a106caa6c77bde06312bf49bedae16747386f38' 
  AND token = 'iu9i9YcfkSk1c4pLYp96gcHqslhy7yQTTNKh10xsJZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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