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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63856bc1a4a623c0eb78e401dcf150af8d105d9b2cfbe6a4ab50fd34324e9968' 
  AND token = 'hSz4FB5cfjJwdRwQDptTdtj/SPGioRyiI0psA4P5bDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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