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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b027a4c872b2ca72bb11f7545a7ca26f809a8568ba4ebd3eb625bbf1c29cee' 
  AND token = 'Oift+O/jbmk+BCL43GAqc8ulHWP3sZmptSqDJCuqn34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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