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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8082342249edc25ff7ef49777fe5f082917f28688e7667918116c6b015de6c' 
  AND token = 'vCiwol2zQf3W7FDWTz1bnMyyBthGmaKrz5Oq0GHBLBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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