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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0663c143e1d732428a8c76096a2d0ac3d34601064e0736ad23063bc93dc38488' 
  AND token = '/kIc61TsRV3IeLvVru9g0SQauJnZVZ+wT1XuKHMcfVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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