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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34358708eb51293c73d7f6478834d1eb2fd8c71e5f02747f0fbf2efa3ba0588' 
  AND token = 'sYoJErViSCrlfdOaAXjEZotAYVi3fiuH5ZUSK4FfRSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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