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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09437f5fa32ac50ca0696fa298865061f8774fda712d2fe5c36276d7f907ee34' 
  AND token = 'MBwBNd45jMDgd+E5YTpVnVt7+1M5VoZ4KpJ8yaAa+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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