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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300f150fd7d30c6a94e4111d55f8287f33e36424f850bbaf5746939c0483975c' 
  AND token = 't2PrkIsDXhFavtTW9r2jsbgR62x2WA64Qa7JDJ3Emb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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