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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9929f84b2f3008a4eb06c41d5f21e01c3d6054a457feb2205802f7148923e7a0' 
  AND token = 'lubBAeKLM1FdjVDpn4wg6q5/tLmt9zZgr+4g4IcSJ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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