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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13601a23fc183c294b7f04346a11866f378485345b9cb98894fbafb64b4d3ec4' 
  AND token = '1mxU4tJHP3+Fywsx9QhvL4iz6N8ymRqZlAGEtqo1B7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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