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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bab7d0d31b93dd1c9e66ca5f0d25a3a1cfe079a76f9705737c2257a446cdfb' 
  AND token = 'D85TRcvVO0bqu8HpDKSCbGzBCHN90TEvCt2/Y/wTsus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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