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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c3fe9ba8ca367cf922e4d8ab8e71d2726729f60fee42897f76fc510602dded' 
  AND token = '7z+hoX0RLyXAdpfptiSVxpvR4Hu2tqx0xpRySHLbw00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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