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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9952018802cbac395b6965ecc4bd897b1df4f8d614d9f89973b266afe4e0eb94' 
  AND token = 'ML9Ihp2wIjckct0SWu2jiMrLW/EJIus7vWMRuOR2bqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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