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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b0430e7e38bc0f5b9040d673084717743bcb489ce86f7bffc4737f00d50d89' 
  AND token = '9fmKvGgiXNOrL19XQDFcm3I62Q8c9l7poVxuWe0wNBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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