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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d0804e97eaabdffd98bba1b6b49f9197d062250c4130d5c4eaa6d7b9510806' 
  AND token = 'uVqf/Yj9Wd36RZnEm9qTtMEOvINnqM0c5CEXLdeAboE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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