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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157308985369cc247edef5f67630b48953557d46ce2082a80bc3372bfba3bae3' 
  AND token = 'Xk0N3sSfwN4Psl6Gi9/0H+kz3/MTd5p2ZkIblH+Xwck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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