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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03e537ef39e6518a1a9c72f483c08870ce8f4e34380a2e50bcd91ff3f970551' 
  AND token = 'o1xQGVShWn81PgHBUnhJaWVYU3jLS6J/8YqYAR7kDC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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