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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17415fb0d00315c4eeaf540e86ae9fb0bbbcf6cfe3a623c6bee473ece349ece' 
  AND token = 'lYM8gn/fCL3fW80TGGMlGXs1FLW9cXBK/2ffXOybTko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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