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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ef05fb200cc2812e41c1ab95141773cf1902a0187c54d7119dbaeafdec96a8' 
  AND token = 'xr/H6sPWC83Qhr7e4ab1y27IexOOmSK1GXqPO78qBHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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