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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dfa25ea31777c4ad0574665dc4f1d49be79e8206b84b89b3c59d7e156ed83a' 
  AND token = 'j7V5uql8tmVtOGYeszqBgxlMfs4lOwEi0gaCS5Ey+3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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