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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db33986a7584658c886d9f61acb5efdad20d62e200753ab6ac2bdd882afbad75' 
  AND token = 'W2G74YGf9ig/jCokix/KyqExCAurb+n7/PTc7caiCCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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