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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca92ef7eb10917c74f71f390b9df35a04380109e07a7de9f2c745f905d7b0ae' 
  AND token = 'VKAyabc/GH+jpoVrH4DyxHbg2go0Wmz98lipzffdRf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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