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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cec537353e42035a18c02afe10fdca0b55be0877c959496c2ae23d964f42283' 
  AND token = '9dpE7kUlw/nxAXnH9FZnqrXSLYgMFQeYYxx9yHC4/A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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