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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5011ac1d07cd642318020b65455d8017d5a3f4dd10e229f89a9e80ad7d52ea' 
  AND token = 'f0BDlLCfe34qtHmGZx5J7sdgIgfToOZqdAtPLFw1w9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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