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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347c1b8044fe23b3388a2658d865555a0aa7b7c00752db3e60ad54113137aa85' 
  AND token = 'PlNNA4HECbFY0rbsjgg+kqmsg8150IseqwoQos5JoT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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