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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a3eee8811b6e1200e6b8e8eeacce659ceabafbc8cab3d1982361b13fde164b' 
  AND token = '5M/ga5f0XH9/8HaTBA5joHXfyFEECeJS23a3mFzVCyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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