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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196b8038822a5f494bdbae9f18845c13a327183578531a5e29435573132beacb' 
  AND token = '0hjbfxG3+hDkr1um7Axwv73sLeWo08Dil47BQ5aQB8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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