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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2007d003aec2ca172cb7dd4eb2f59513f0d834a17abe6c59474d906616a7ee' 
  AND token = 'pxnwbFcPUuxk4cwmWxOLd3Lw9Op0n1hJJtV+7tuAPCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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