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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4e01f54f0a70ff0c2b8b50bf0e14adb30c6d7e10b92cd6d1861008f629c611' 
  AND token = 'SsHqskbuChS5Pv6vayWGszVr5vhonYU2ziJJkWtEruI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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