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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83fe4015c351f2d1768f3a444d333e9ae5b4a7650e6e9ee81c0967433e4bac8' 
  AND token = '/YTFMSw6YSR9I1JHHoM5641b+9PYIZJXD8YGJWg6tSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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