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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0befd57606f5b9af91a862a6b26dccd980cc943f1c3731324cfd7042e93f8cce' 
  AND token = 'zhVm9a5nOc01ucEF1rNGCuKvXpRLc4ED2V7/GIQIiiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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