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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eaabc5c2a5eb2f52e97de34bfb0027c3c232b002274050358be4e5680d9288d' 
  AND token = 'j9EZuk+7kvgkrX4Bm9ZIJ0qfIFE8R/pZSzsNE1jaVcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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