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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0921360b41a631104af8d6c5525ae549ac8d2db150c368c39e29af04aa9a04fb' 
  AND token = 'Znby7A0LUzN5zoCYB5cclROzl4UR+1NCiBtEH0Xbmh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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