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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be13f5966aed5b0c5a26c7286a53985e53389f9a435ad0d2772caed8dc5253a6' 
  AND token = 'hYEy/kVjbymi0hUzEK6cLyGoPKicbOIsZKHmNdWOnb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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