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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30e860e842563f7cc1e2005085d3f7d0bd3dc45e8a1efd4d898db427471afc2' 
  AND token = '1nhj9iL94gmSsbFi+rcnyB2iSTQQOo+ljo4c7F9L9V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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