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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa5d6df16f75f37ad9f68f99392bbfcc4bd274799d9c1f730a791c18e0c878e' 
  AND token = '8gBFcOSx3AexGVdiiIEdhlgb37lydDTlHBHcHXPU++Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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