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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a473fb6ec45b635e5cf466d48d7514cae4879d48a6865b18acd4cbceac42cb4' 
  AND token = 'VIOwjTfqsAgja9YAuAtmtkWTSj2we8Eoho9+yM1dKcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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