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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b826b0c20a3bb1eb80a1bde805be64461608497fd79384248e554ab534925b' 
  AND token = 'N/5Ncd5VrZCm/fElc6kdSc6t0uAatcJEdBX+2ZmhaJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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