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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565bd27784d4b17cabca293837c34c53ee747dcc978964975ea99e48afe7ca0a' 
  AND token = '8Zlv6gs+ZRgpyV9isxoH9QHbISDlZ+yN/kAfkjY+7bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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