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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e00523ff5979229b8e37ebc0532611ae4cdc28fcaabfcf7cc5a854b83434bf' 
  AND token = 'cIt3ZXzoM9Jd4gfD2yxVlbtx8AC+rDtgdGWh7gI18eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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