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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbe40dc50cb335b3e72952ee8dd0526d364567db5411d03b87e9d470da8a6d8' 
  AND token = 'AXjmkg5/hrw7SZVq7U4mxBv86AZF1quyu71GfZJ46d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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