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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b020c9a187af51fa921850e9f65adc77d84476db0e0d13bf8c48f95bd3633e9' 
  AND token = 'kaUXNd040tvlC6AxfQQngL4DstaZSMcC8zqtO32zzXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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