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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe17b80e7efdc109817abdff74022c9c82e7cbfbf006182e144e9b6b5c485907' 
  AND token = 'Dme1tMuIrHb1JkasPV1xmO/rIAmJs9u1Cp1jDC4tyRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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