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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74494fb8eed778f7658320c01621ac2b0ca25bf274a92d785d5cef7b01e58b27' 
  AND token = '7UkfbdioZBV0+6F1FCKbGfD0KQ8l9SxRGZMY+f0O7EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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