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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9e3aa2c827c37ac758c09a75e78575a33d0b775d9fcfcb61f0bbd71406ff25' 
  AND token = 'W8jzMlsndJ4sX9N8zQxXTszpYXzexp9aAw81F/DZA48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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