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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1baeacea11749dfbfdf2bc78c2e63a4a400ce28e88e0ad52c3b015d80c4654d3' 
  AND token = 'WHd7jImPomaoc3BwhtlAjCkKsyd4YafdiaZpMnGN5t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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