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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63fa3e58a6860f2bf6d0ee68ad7e8de6417520222790228185f3d708e47b8b3' 
  AND token = 'CH1MwUTDR/uzbuR0SlFTPdx37QL2aJO7NADHJ4NZAnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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