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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a338dfd931dc1d9a8e29453450a5c27d39f9f9b63865c1478e839aaf6b68a90e' 
  AND token = 'YN5Vz1yOwoNZSC1mautuHMsXvb6cXfd15N/OFc8eHLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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