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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5113452709054d9b0ab985ccb565caac6ba3068f3500dc72a933808d43045782' 
  AND token = 'vXVEwPSUU+R2hGmanBCH6c7mIqkh5NOWuvpa3byg964=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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